This Tongsheng/SFM mid drive motor with torque sensor is the cheapest and good torque sensor mid drive motor in china, you can feel the power from your foot to start the ebike,so you don't need use throttle to start the ebike TSDZ2B electric bicycle central mid motor with torque sensor, this model without coaster brake function , If you need coaster brake function, please add US$50. we will send motor with coaster brake function to youcoaster brake function -----it is means If you bike don't have any brake lever, you must use the motor with coaster brake function, otherwise you can choose the motor without coaster brake function  

Speed: 15Km/H-45Km/H Top speed 45km/H

TSDZ2B:It is new version,so the main gear is double clutch

New version TSDZ2B has two clutches designed on the main gear, Main gear is disengaged from the chain during riding, So it feels as easy to ride as a bicycle; Old version TSDZ2 rides with main gear, Main gear turns with small gear.So the riding resistance is larger than bicycle

New version motor has improved the